A word from Tracy, the 'Frozen Elsa' costume creator:

Our Pit bull Molly is wearing her Elsa costume. We got the idea when she laid down on top of one of the girl's costumes, From there we let Molly try on the cape and wig along with a crown. She looked so regal. The real trick was getting our Queen Molly to hold still for a picture. After a while she shook the wig off but kept the crown.